此文章赠给那些自学一段时间但又不得入门的人，因为我也是从新手过来的，绕了很多圈。希望我的教程给某些需要帮助的人能够得到一些帮助。-This article is presented to those self-study for some time but shall not be started, because I come from the novice around a lot of laps. Hope my tutorial to get some help to some people who need help.